Nebulae, as seen from the inside

All the nice pictures of nebulae that we usually see everywhere are of false "exagerated" colors, or true colors from a long exposition. A nebula seen with the naked eye through a good telescope is usually a gray blob with maybe some weak/dark colour tint.

But what would see an hypothetical human observer, if he/she was standing right in the middle of the nebula ? Would the light seen with the naked eye be of stronger intensity/color ? To what point, compared to the usual over-exposed pictures ?

I guess nobody actually knows the answer to this question (obviously !), but I'm still wondering what is the "expert" opinion on this.

The stars appear as specks of light and we see somewhat their surface brightness, comparing Sirius to Betelgeuse for example. If they were closer and more densely packed, as they would be if perceived from within the nebula or a globular cluster, we could see more detail and possibly more color from ionized gases.
How much more would be an interesting challenge for a simulation.